Variation of refractive index of polystyrene with molecular weight: Effect on the determination of molecular weight distributions

Sensitive refractive index measurements on solutions have indicated that the narrow molecular weight polystyrene samples prepared by the Mellon Institute method exhibit a small systematic molecular weight–refractive index dependence up to 300,000 and higher. This upper limit is higher than had previ...

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Bibliographic Details
Published in:Journal of applied polymer science 1968-06, Vol.12 (6), p.1373-1377
Main Authors: Barrall II, E. M., Cantow, M. J. R., Johnson, J. F.
Format: Article
Language:English
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Summary:Sensitive refractive index measurements on solutions have indicated that the narrow molecular weight polystyrene samples prepared by the Mellon Institute method exhibit a small systematic molecular weight–refractive index dependence up to 300,000 and higher. This upper limit is higher than had previously been suggested. Sensible consistency is generally assumed above a few thousand molecular weight. The effect on this molecular weight–refractive index dependence on gel permeation chromatography and light‐scattering molecular weight measurements on polystyrene standards is illustrated.
ISSN:0021-8995
1097-4628
DOI:10.1002/app.1968.070120609